The lights are on
There's not many good games with 4 player co-op.
Left 4 Dead
Marvel Ultimate Alliance 1 and 2
Guitar Hero World Tour
2 player co-op games include:
Gears of War 1 and 2
Resident Evil 5
Rainbow Six Vegas
Army of Two
Ghost Recon Advanced Warfighter 1 and 2
If you want games without guns, the only one I can think of is Banjo Kazooie Nut's and Bolts. I hope that helps you!